oss-sec mailing list archives
Re: taskstats authorized_keys presence infoleak PoC
From: Vasiliy Kulikov <segoon () openwall com>
Date: Tue, 21 Jun 2011 23:51:28 +0400
Hi Josh, On Tue, Jun 21, 2011 at 15:24 -0400, Josh Bressers wrote:
----- Original Message -----/* * This program tries to learn whether ~user/.ssh/authorized_keys exists * and is nonempty for any user on local machine. It uses world-readable * taskstats' nature to get somewhat private io statistics information. If * implant taskstats or /proc//io polling into ssh client, it would be * possible to learn precise authorized_keys' size (and estimate private * key's(s') size).Are you considering this a flaw, or just an interesting security exercise?
The PoC itself is the latter, but i *suppose* procfs and taskstats may be used to get much more private information (hey, this is just a PoC!) and to carry out something like timing attack against specific programs, but using this statistic information instead of time deltas. However, I'm not familiar with timing attack carrying and cannot realize whether it is generic or highly conditional flaw. So, I'd not request CVE or anything for it. Thanks, -- Vasiliy
Current thread:
- taskstats authorized_keys presence infoleak PoC Vasiliy Kulikov (Jun 21)
- Re: taskstats authorized_keys presence infoleak PoC Josh Bressers (Jun 21)
- Re: taskstats authorized_keys presence infoleak PoC Vasiliy Kulikov (Jun 21)
- CVE request: kernel: taskstats/procfs io infoleak (was: taskstats authorized_keys presence infoleak PoC) Vasiliy Kulikov (Jun 24)
- Re: CVE request: kernel: taskstats/procfs io infoleak Vasiliy Kulikov (Jun 25)
- Re: CVE request: kernel: taskstats/procfs io infoleak Eugene Teo (Jun 26)
- Re: [Security] CVE request: kernel: taskstats/procfs io infoleak (was: taskstats authorized_keys presence infoleak PoC) Linus Torvalds (Jun 26)
- Re: [Security] CVE request: kernel: taskstats/procfs io infoleak (was: taskstats authorized_keys presence infoleak PoC) Andrew Morton (Jun 28)
- Re: [Security] CVE request: kernel: taskstats/procfs io infoleak (was: taskstats authorized_keys presence infoleak PoC) Linus Torvalds (Jun 28)
- Re: [Security] CVE request: kernel: taskstats/procfs io infoleak (was: taskstats authorized_keys presence infoleak PoC) Linus Torvalds (Jun 28)
- Re: [Security] CVE request: kernel: taskstats/procfs io infoleak (was: taskstats authorized_keys presence infoleak PoC) Vasiliy Kulikov (Jun 29)
- Re: [Security] CVE request: kernel: taskstats/procfs io infoleak (was: taskstats authorized_keys presence infoleak PoC) Vasiliy Kulikov (Jun 29)
- Re: [Security] CVE request: kernel: taskstats/procfs io infoleak (was: taskstats authorized_keys presence infoleak PoC) Vasiliy Kulikov (Jun 29)
- Re: taskstats authorized_keys presence infoleak PoC Josh Bressers (Jun 21)